Internal-combustion engine



FIG. 1 is a first perspective view of an internal-combustion engine;

FIG. 2 is a second perspective view of the internal-combustion engine;

FIG. 3 is a front elevation view of the internal-combustion engine;

FIG. 4 is a rear elevation view of the internal-combustion engine;

FIG. 5 is a top plan view of the internal-combustion engine;

FIG. 6 is a bottom plan view of the internal-combustion engine;

FIG. 7 is a right side elevation view of the internal-combustion engine; and,

FIG. 8 is a left side elevation view of the internal-combustion engine.

In the drawings, the broken lines depict portions of the internal-combustion engine that form no part of the claimed design. 

CLAIM The ornamental design for an internal-combustion engine, as shown and described. 